By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:

Trackback:

Send Trackbacks to (Separate multiple URLs with spaces) :

Post Icons

You may choose an icon for your message from the following list:

No icon

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register. Please enter your desired user name, your email address and other required details in the form below.Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.

Email Address:

Log-in

User Name

Remember Me?

Password

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Click here to view the posting rules you are bound to when clicking the'Submit Reply' button below

Additional Options

Miscellaneous Options

Automatically parse links in text

Automatically embed media (requires automatic parsing of links in text to be on).

Automatically retrieve titles from external links

Click here to view the posting rules you are bound to when clicking the'Submit Reply' button below

Topic Review (Newest First)

01-30-2015 08:50 AM

eherlihy

Re: Perkins 4.108M DIY Rebuild -- A Narrative

Dude, you realize that you started this epic in December of 2012... Twenty five months ago...

We want pictures!!! (motor-porn).

I'm glad you're back!

01-30-2015 12:07 AM

warby12

Re: Perkins 4.108M DIY Rebuild -- A Narrative

But we still appreciate it Anyone who takes the time to share with others gets a big thank you from me for what it's worth, thanks Porfin!

I completed the rebuild, and the engine runs like a champ. Smooth, good pressure, clear exhaust. Shortly after I had it running (in my driveway) and...

I had to drop the project, and prepped the motor for storage.

And there she sits, waiting for a blissful reunion with the boat.

Volume 2 of this epic saga will address the reinstallation.

I'm betting nobody here is gonna pay me an advance on THAT tale...

08-27-2014 05:08 PM

FineKetch

Re: Perkins 4.108M DIY Rebuild -- A Narrative

Within this thread there is a reference to the Perkins Build List #ED70058, and I'm wondering if anyone came up with an electronic copy that can be shared. I also have been seeking a copy of the document for similar purposes as described in this thread, and cannot locate anyone with a copy.

Any assist would be appreciated

06-28-2014 10:25 AM

v40163

Re: Perkins 4.108M DIY Rebuild -- A Narrative

Edit: Couldn't you have simply put the pin of your dial indicator down the injector hole to measure TDC? It would have saved pulling your valve spring etc.[/QUOTE]

That's exactly what I did when I timed mine. PorFin is correct that you cannot get an absolutely clear shot to the piston crown by going down through the opening in the combustion chamber insert. But on my engine at least it was only a few (maybe five) degrees away from "parallel". I visualized the situation as a right triangle made from a perfect parallel, the amount of error between the perfect and the actual, and my piano wire which represents the actual. The piano wire is the hypotenuse of the triangle and at the amount of error that I saw is very nearly the same length as the perfect.

Is that clear as mud?

Anyway, I removed the rocker cover in order to identify #1 cylinder's compression stroke TDC (both rocker arms "loose"), which allowed me to get close to TDC. I then cut a length of 0.072 piano wire (available at a hobby shop) to a length sufficient to touch the piston crown and extend far enough out of the cylinder to reach my dial indicator. I removed the threaded end of the dial indicator so that the wire would fit up inside and couldn't slip. I mounted a magnetic base on top of the (now bolted down) rocker cover and set the dial indicator's height about midway through its travel. Then I rocked the crankshaft back and forth to find absolute TDC and zeroed the dial indicator.

Then I rotated the engine OPPOSITE to its normal rotation until the dial indicator read 0.200 inch. THEN I rotated the crankshaft in its normal direction until it read 0.120 inch (the static check point for the 4.107 per the workshop manual fuel injection pump table).

I removed the inspection cover from the (installed) pump and rotated it until the "A" mark lined up with the circlip as PorFin's beautiful pictures show (how do you take those anyway?!)

Tightened everything up and I was good to go!

Now to finish the installation in the boat...

Oh, although I used the ones that I already had, if you're interested in doing this yourself you don't need a hugely expensive dial indicator and magnetic base. Harbor Freight has them for less than $30 US TOTAL for both items.

Ray Russell
Valiant 40V163
Enshalla

03-24-2014 11:06 AM

myt147

Re: Perkins 4.108M DIY Rebuild -- A Narrative

Quote:

Originally Posted by JSROOKS

Wow, what a great project. My 4.108 has a slow main bearing leak, so I will be in partial rebuild mode soon I think.

Does anyone know the maker of the great-looking alternator tension fitting that Porfin has used here? I have never see one like this before.

I did the same modification to my 4-108, but took it down to the starboard engine mount flange so as not to have to shorten the tie rods. let me know if you need more info.

cheers

03-14-2014 07:07 PM

zeehag

Re: Perkins 4.108M DIY Rebuild -- A Narrative

my 4-108 is ka lunk and has its own thread..... and is touring mexico as we speak, as parts are in casimiro castillo, manzanillo, and joluco.....lol...travels better than i do at this point....will have completely brand new gutz. saved were the cam and crank, and block and head is machines,and the rest is new. thank gods is pesos.
after this i have to go get my jib repaired better, as the repair done was FAIL. and a tank..mebbe i can sail again next year....

03-14-2014 02:21 PM

JSROOKS

Re: Perkins 4.108M DIY Rebuild -- A Narrative

Wow, what a great project. My 4.108 has a slow main bearing leak, so I will be in partial rebuild mode soon I think.

Does anyone know the maker of the great-looking alternator tension fitting that Porfin has used here? I have never see one like this before.

But then again, I don't get out much.

Thanks!

02-09-2014 04:42 PM

Wulf

Re: Perkins 4.108M DIY Rebuild -- A Narrative

I just stumbled across this excellent thread and couldn't put it down. I hope Porfin is ok, has anyone heard from him? Fingers crossed...

This thread has more than 10 replies.
Click here to review the whole thread.